<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/react.js"></script>
    <script src="./lib/react-dom.js"></script>
    <script src="./lib/browser.js"></script>
</head>
<body>
    <div id="root"></div>

    <script type="text/babel">

        function formName(user){
            return user.firstName + '' +user.lastName;
        }

        const user = {
            firstName:"尹彪彪",
            lastName : "ybb"
        }

        function getGreeting(user){
            if(user){
                return <h1>hello:{formName(user)}</h1>
            }
                return<h1> hello lastName </h1>
        }

        // const ele = (
        //     <div>
        //         <h1>hello,{formName(user)}</h1>
        //         <h1>hello,{ 1 + 1 }</h1>
        //     </div>
        //     )

        let h = getGreeting(user);

        ReactDOM.render(h,document.getElementById("root"))
    </script>
</body>
</html>